As to why it's slow, if you're not getting any errors then probably
because of too much interleaving. I keep my target sessions set low(4)
which helps a little. But really there isn't a very good way to limit
this in a complex environment. There should be a "max sessions", but
that's beside the point. One way I've improved my cloning speed is by
cloning every "valid" saveset on a volume. Then it doesn't have to pick
and chose as much when it clones the volume. I get 30-80MBs sec with
9940B drives. You may not want to clone every saveset, but we do so
this works well for us.
Joel
-----Original Message-----
From: Lewis, Terry {Info~Palo Alto} [mailto:TERRY.LEWIS AT ROCHE DOT COM]
Sent: Wednesday, April 09, 2003 4:33 PM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: Re: [Networker] Why is cloning so slow ?
Julio,
I don't know why it's so slow, but I just went through a very
similar exercise with the same results about 2 weeks ago,
also using DLT7000 drives. I attributed the slow speed to
the fact that the cloning process was having to "de-multiplex"
2 archive save sets from the original volume. I haven't yet
been able to confirm this, but it may explain your case too.
When I first started archiving, I'd archive things twice rather
than clone. Lately, I've tried to use cloning instead because
sometimes getting one archive to complete successfully,
especially a large archive, has been a challenge all its own.
Terry
> -----Original Message-----
> From: Julio Porras [SMTP:Julio.Porras AT VENALUM.COM DOT VE]
> Sent: Wednesday, April 09, 2003 1:28 PM
> To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> Subject: [Networker] Why is cloning so slow ?
>
> I am cloning an Informix full archive using our HP A4846A tape library
(with
> 2 DLT 7000 tape drives) and it's taking too long to run. It's going at
2500
> to 3000 KB/s (for a 90GB data volume). Is this speed normal? What max
speed
> should I expect for my hardware?
>
> Thx,
> Julio Porras
> Especialista de Sistemas
> CVG Venalum
> 286-9506898
> 416-7985875
>
>
> --
> Note: To sign off this list, send a "signoff networker" command via
email
> to listserv AT listmail.temple DOT edu or visit the list's Web site at
> http://listmail.temple.edu/archives/networker.html where you can
> also view and post messages to the list.
> =*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
--
Note: To sign off this list, send a "signoff networker" command via
email
to listserv AT listmail.temple DOT edu or visit the list's Web site at
http://listmail.temple.edu/archives/networker.html where you can
also view and post messages to the list.
=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
--
Note: To sign off this list, send a "signoff networker" command via email
to listserv AT listmail.temple DOT edu or visit the list's Web site at
http://listmail.temple.edu/archives/networker.html where you can
also view and post messages to the list.
=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
|